Well for me this (U700.6.8.1957) is ... buggy.
1. stopped working send-to-pocketbook service
2. stopped working
https://... links in browser.
I contacted support, they asked me for 'factory reset' - done, no help
then "format internal memory" - done, no help
they send me previous firmware ... but I cannot install it.
I put SWUPDATE.BIN file in root directory, tried to start with previous/next buttons but reader does nothing.
KJ